ETL (extract, transform, and load) jobs involve managing data pipelines, building data warehouses, and ensuring data quality. 
ETL developer responsibilities
Process management
Define the ETL process, including data processing boundaries and system architecture 
Data warehouse
Define the architecture and tools for loading data into the warehouse 
Data modeling
Read, analyze, and transform data to determine how to represent it in the warehouse 
Data quality
Validate and clean data to meet quality standards before loading it into the target system 
Data pipeline creation
Develop tools that organize and filter data so that end-users can find and use it 
Data storage
Determine the storage needs of the business and analyze options to find the best fit 
ETL tester responsibilities
Data verification: Verify data, spot anomalies, and ensure data meets business requirements 
Testing: Perform manual and automation testing of data sources, extraction, transformation, and loading 
ETL skills 
Strong analytical skills
Proficiency in scripting languages such as Python scripting

Career Level - IC3